Door jamb liner

ABSTRACT

A door jamb liner in which a mounting frame is encased by a masking frame cosisting of pre-manufactured parts joined together by a tongue and groove system, there being moulded mounting strips at the vertical front faces over which the parts of the masking frame are fitted from both sides. These parts are moulded strips which extend beyond the top of the mounting frame and down to floor level and which have a web which rests against the mounting frame and two legs one of which rests against the plaster with its edge flush with the wall surface while the other engages in a groove in the adjacent part of the masking frame.

United States Patent [1 1 Hoffmannet al.

[451 Mar. 11, 1975 1 DOORJAMB LINER {22] Filed: July 27, 1973 [21] Appl. No.: 383,119

[30] Foreign Application Priority Data July 31, 1972 Germany 2237625 [52] US. Cl. 52/211, 52/216 [51] Int. Cl E06b 1/08, E06b 1/32 [58] Field of Search 52/211, 208, 210, 212-216 [56] References Cited UNITED STATES PATENTS 1,361,586 12/1920 Johnson 52/216 X 1.731.037 10/1929 Baum 52/216 1,788,143 1/1931 Baum.... 52/216 X 1,868,168 7/1932 Hull 52/210 1,926,673 9/1933 Gregg 52/211 2,741,345 4/1956 Herr 52/211 3,103,263 9/1963 Leeser 52/213 3,634,962 1/1972 Peterson 49/380 X 3,769,773 11/1973 Mochizwki 52/211 X FOREIGN PATENTS OR APPLICATIONS 1.917.613 1/1971 Germany 52/213 600,926 4/1948 Great Britain 52/21 1 1,939,229 2/1971 Germany 52/212 1,307,728 9/1962 France 52/212 1,258,235 3/1961 France 52/212 436,656 11/1967 Switzerland 1,258,381 5/1961 France 52/211 44,002 4/1938 Netherlands 52/211 Primary Examiner-Ernest R. Purser Assistant ExaminerLes1ie A. Braun [5 7] 9 ABSTRACT A door jamb liner in which a mounting frame is encased by a masking frame cosisting of pre manufactured parts joined together by a tongue and groove system, there being moulded mounting strips at the vertical front faces over which the parts of the masking frame are fitted from both sidesv These parts are moulded strips which extend beyond the top of the mounting frame and down to floor level and which have a web which rests against the mounting frame and two legs one of which rests against the plaster with its edge flush with the wall surface while the other engages in a groove in the adjacent part of the masking frame.

11 Claims, 16 Drawing Figures DOOR JAMB LINER The invention isconcerned with a method for the installationof adoor jamb liner. The invention is also concerned with a jamb liner suitable for use in carrying out the method.

It is an aim of the present invention. to provide means by which the work is made economical, and the danger of damage during construction is reduced or avoided whereby a door frame had to be developed which can be conveyed in the disassembled state to the site of construction where the individual parts, manufactured in the simplestpossible manner, are joined together.

To achieve these aims, the new method according to the invention provides, first of all, a mounting frame which is built into the rough brick work and can be used expediently as a permanent frame-work. This mounting frame serves as a support for a jamb liner which provides a swivelling bearing for the door; the edges of the mounting frame extend along the top and side edges of the door opening and serve as smoothing edges during plastering. The new method provides, moreover, a fully finished masking frame which is installed after plastering, floor-laying, and/or other work connected with construction. The characteristic feature of the new system is that the mounting frame is encased by a masking frame which consists of premenufactured parts that engage with one another through a tongue-and-groove system, and that the two vertical front faces of the mounting frame have moulded mounts which correspond to parts of the masking frame which are slipped on to the mounts from the sides, the mounts being continuous moulded strips, extending beyond the top edge of the mounting frame and down to floor level, their flanges butting against the mounting frame and one of their two legs which constitute the moulding resting against the plaster with one of its edges flush with the wall surface, while the other leg engages with a corresponding groove in the masking frame.

The system according to the invention makes an economical and improved surface treatment possible, avoids damage during construction, and protects the masking frame against the infiltration of moisture; it permits the door frame to be taken in the disassembled state to the site of construction and assembled then and there. It is no longer necessary to distinguuish between left hand side and right hand side components. The process of installation is thus much easier and production and storage are much simpler than before. Moreover, the individual components can be manufactured in a single stamping operation which again simplifies production and reduces the corresponding costs.

The drawings show by way of example only, embodiments of the invention. In particular;

FIG. 1 shows a mounting frame used in the application of the new method in schematic perspective view;

FIG. 2 shows an arrangement according to FIG. 1, but depicting another form of mounting frame in horizontal section;

FIGS. 3 to 6 are schematic views of examples of the manner in which the new method may be carried out;

FIG. 7 shows the longitudinal side-piece of a mount ing frame of a jamb-liner according to the invention, in elevation;

FIG. Sshows the longitudinal side-piece of the frame according to FIG. 7, in enlarged section on the line II-II of FIG. 7;

FIG. 9 shows the transverse piece of a mounting frame of a jamb-liner according to the invention, in side elevation;

FIG. 10 shows the arrangement according to FIG. 9 in plan;

FIG. 11 shows the wooden parts of the masking frame which are fixed to the frames according to FIGS. 1 to 10, in sectional plan and to an enlarged scale;

FIGS. 12 to 16 show details of variants of the system according to the invention, depicted in plan and elevation seen from the front and from the side.

Referring to the drawings, a mounting frame 2, to which a grooved part 3 and a jamb part 4 of the door system are joined to form a masking frame, is fitted into the brick work 1 (FIG. 2). Together, the mounting frame and the masking frame constitute a jamb liner. Plastic mouldings in strip form, 6, 7, which run along the front edges of frame 2 have extensions 8, 9, which engage with grooves 10, 11 in the mounting frame where the two parts are glued together. Each of the mouldings has a short leg, 12 and 13 respectively, and a long leg, 14 and 15 respectively. The lower member of the mounting frame 2 is a metal strip 16 with a rectangular cross-section (see also FIGS. 4 to 6) which is fitted into grooves in the vertical posts of the mounting frame 2. The grooved part 3 has a narrow groove 17, and a wider groove 18 (FIG. 2). The short leg 13 of moulding 7 fits into the narrow groove 17, while a tongue 20 on the jamb part 4 engages with the wider groove 18. The jamb part 4 has a narrow groove 19 which corresponds to the short leg 12 of moulding 6. The front end 21 of the tongue 20 is bevelled so that it can be inserted easily into groove 18. The surface 22 of the tongue 20, which is opposite to the bevelled end 21, lies in the plane of side 43 of the jamb part 4. As a precaution the depth of groove 18 is slightly greater than the height of the tongue 20. A rubber seal 23 at the projecting face 24 of the grooved part 3, which face lies opposite the side 43 of the jamb part 4 and serves as a door stop, provides for noise reduction when closing the door.

'The front edge 39 of the long leg 14 of moulding 6, the front face 25 of the jamb part 4, and the door face 26 are in one and the same plane with the wall surface 27, while the front edge 40 of the long leg 15 of moulding 7, and the front surface 28 of the grooved part 3 are in the plane of the wall surface 29. The recesses 30, 31 between the two legs of the mouldings 6 and 7 constitute blind edges around the jamb liner.

The manner in which the new method is executed is as follows. As shown in FIG. 3, the frame 2 with the mouldings 6,7 and the metal strip 16, is fitted to a concrete base 32, forming a formwork and, as shown in FIG. 4, is inserted into an aperture in the wall 1. The mounting frame can also be used as a permanent formwork for the door opening while the wall is built up.

FIG. 5 shows the assembly after completion of the walls and floor. At the left hand side of the metal strip 16 shown in FIG. 5, floor tiles 34 have been fitted to a screed layer 33, while at the right hand side of the metal strip 16 a screed layer 35 is covered with linoleum 36. The metal strip 16 has more than one function in connection with floor covering. On the one hand, the floor tiles 34 are adjusted to the level of the upper edge of strip 16, and on the other hand, the metal strip serves as a separating member between the tiled section of the floor and the linoleum covered part which lies at a lower level. The step between the linoleum floor and the tiled floor is reinforced by the metal strip 16.

In the stage of assembly according to FIG. 5, the wall 1 is coated at either side with plaster layers 37, 38. When plastering, the front edges 39 and 40 of the two legs l4, 15, of the mouldings 6 and 7 serve as smoothing edges, ensuring that plaster and jamb-liner present one, continuous, surface. The plaster layers 37, 38, are covered with wallpaper 41, 42, again finishing at the front edges 39, 40.

In the stage of assembly according to FIG. 6, the grooved part 3 and the jamb part 4, which constitute the masking frame, are slid over the mounting frame 2 and fixed to it. The vertical members of parts 3 and 4 do not extend to the bottom ends of the posts of frame 2 but terminate at the levels of floors 34 and 36 respectively. They are assembled with the mounting frame 2 by inserting the short legs 12 and 13 of mouldings 6 and 7 into the grooves 17 and 19 (compare also FIG. 2). To connect the grooved part 3 with the jamb part 4, the bevelled end 21 of the tongue (FIG. 2) is coated with glue so that the two parts 3 and 4 which constitute the masking frame adhere to each other after joining. Since glue is applied only to the bevelled side of the tongue 20, there is no danger of glue emerging from the joint towards the outside, at the front surface 24.

The mounting frame according to FIG. 1 consists of two longitudinal side pieces 101 and a transverse piece 102; with the frame built into the opening in the wall the longitudinal side pieces extend vertically and the transverse piece 102 connects these longitudinal side pieces at their upper ends. The frame thus formed is embedded into, and joined to, the brick work and serves for the fitting of the masking frame which suitably consists of wood. As shown in FIG. 1] it is composed in the illustrated embodiment of parts 103 and 104, and it is designed for the pivoting mounting of the door. The door stop is indicated at 104a.

The longitudinal side pieces and the transverse piece each consist of two longitudinal bars 106, 107, and 108, 109 respectively which run parallel to one another and extend in the longitudinal direction of the respective components; and of transverse bands 110, 111 be tween the longitudinal bars which they connect with each other; viewed in the longitudinal direction of the bars, they form a series of equidistant bands. These transverse bands can for example be welded to the longitudinal bars, and they can be reinforced by profiling. Their end sections 112, 113 are anchored in the brick work. The spacing between the two bars of the longitudinal side pieces is the same as that between the bars of the transverse piece, such as to bring the longitudinal side pieces into line with the transverse piece. Each bar of the transverse piece corresponds to a bar of a longitudinal side piece, and each bar of the transverse piece connects at one of its ends with the corresponding bar of one longitudinal side piece and at its other end with the corresponding bar of the other longitudinal side piece.

The bars of the longitudinal side pieces of the mounting frame can be assembled at the site of construction by joining their upper end sections to the adjacent ends of the corresponding bar of the transverse piece, to construct individual parts or independent structural components, the elements being, for example, riveted together. An adaptor 114 which consists of two perpendicular legs 115, 116, has to be used with each joint, the legs being connected respectively with one of the two bars which are joined together. In the example depicted in the drawing, leg 115 is welded to the corresponding bar of the transverse piece 102 as indicated at 117, while the other leg of the adaptor is riveted to the corresponding bar of the longitudinal side piece, a bore 118 in the adaptor aligning with a bore 118a in the corresponding end portion of the bar, so that the two bores can accommodate a continuous connecting-rivet or the like. The legs 115 and 116 of the adaptor 114 have angular cross-sections, because they consist of a flat main section 119 which corresponds to the cross web of the matching bar, and of an edge section 120 which extends at right angles to the main section, projecting from the latter towards the outside of the frame. In this connection, one of the legs, 115, rests against the corresponding bar of the transverse piece, from the inside of the frame, the main section 119 being welded from the inside to the flat cross web of the U-shaped bar, and the edge section 120 resting flat against one of the legs of the U to which it is, for example, riveted. The adaptor is an integral component, punched and bent as required. The advantage of this form of adaptor is that on the one hand welding is simplified and, on the other hand, the parts on the other side can be assembled more easily under good control.

The top ends of the bars of the longitudinal side pieces which, like the bars of the transverse pieces have a U-shaped cross section with the open end of the U pointing towards the outside and the legs of the U 135, 136 having different lengths, with the shorter leg always being away from the brick work have the same form. Moreover, the two ends of the transverse pieces have the same form, whereby the end sections of the bars of the longitudinal side pieces and the bars of the transverse pieces correspond to each other. By virtue of this arrangement no distinction has to be made between right hand side components and left hand side components when assembling the parts of a door frame. The form of the bar ends is such that a single punching operation suffices for their manufacture. The arrangement can be, for example, that the two ends of the bars of the longitudinal side pieces and/or of the transverse pieces of a frame finish in a straight edge extending perpendicularly to the longitudinal axis of the bar. Alternatively it could be arranged that the two bars of the longitudinal side pieces and/or the bars of the transverse pieces of the frame terminate in an edge which extends at an angle in relation to the longitudinal axis of the bar, corresponding to a broken line, the inclined edges extending from the outside and bottom, towards the top and the inside, as indicated in FIG. 9, where an edge of this nature is depicted with a longitudinal bar of a transverse part 2 in elevation.

The figure shows as indicated at 121, 122 that the edges are twice recessed, whereby the edges are composed of a first portion 121a and a second portion 12lb adjacent to the former and extending parallel to the longitudinal axis of the bar, a third portion 122a which is perpendicular to the longitudinal axis of the bar, and a fourth portion 122b which is inclined to the longitudinal axis of the bar. The two first portions, 121a and 121b, have approximately the same length; the

third portion 122a again is approximately as long as the fourth portion 122b. The arrangement can advantageously be such that the length of the first and second portions is related to that of the third and fourth portions in a ratio of, say, I 2. The figure moreover shows that the inclined finishing edge extends from the inside towards the outside, towards the bent edge section of the adaptor, whereby the leg of the corresponding bar which is adjacent to the fourth, inclined, portion extends beyond the end of the edge, for example, by an amount not greater than the length of the first portion, and being, for example, half this length. In this way the finishing edge can be manufactured in a single stamping operation provided it has the necessary strength and resistance to bending.

The drawing shows that the bars of each component are staggered in relation to one another in the direction of the plane of the door (which is indicated by the arrow 112a in FIG. 8). In this way provision is made for a door stop in such a manner that the bars which are facing the door, i.e., 107 and 109 respectively of each part are recessed in relation to the door. The transverse bands 110 and 111 respectively are, for this purpose, offset by an amount of approximately K, about halfway between the two bars which have to be connected, i.e., at positions 110a, 111a, this amount corresponding approximately to the amount by which the two bars are staggered in relation to one another. (The manner in which the parts 103, 104, of the wooden lining are fitted to the bars is indicated in FIG. 2). The transverse bands are welded to the two bars which have to be connected, and their free ends 112, and 113 respectively, are bent at right angles with the portions resting against the bars pointing away from the door and towards the brick work. They serve as anchorage means with the brick work.

It has moreover been arranged that the length of the bars (l07-109) of the longitudinal side pieces and the transverse piece which are facing the door (i.e., the bars which are offset in relation to the door) exceeds the length of the other bar in each piece by an amount which corresponds approximately to the amount K by which the bars of the individual parts are staggered in relation to each other. In this way it is ensured that the bars of the longitudinal side pieces are joined smoothly to those of the transverse piece.

The variants shown in FIGS. 12 to 16 are designs suitable for doors which open right up to the ceiling where the upper end is finished by means of a wooden or glass dead-face. The variant depicted in FIGS. 14, 15 and 16 has an exchangeable transverse piece, mounting bars 130 of U-shaped crosssection being used in which the U opens downwards and the legs of the U, 130a and 130b, extend vertically. The crossweb 1300 of the U- shaped bar serves as the base or bottom end which supports an inserted glass plate. This supporting bar is designed to control and support a plate, for example a glass plate, the upper edge of which rests inside the bar which is equipped with cornerpieces 131, 132 fixed to the bar at either end, for example by means of rivets or the like. The arrangement is such that the horizontal leg section 1330 of the corner-piece rests against the base 130s of the U-shaped bar, while the vertical leg 13312 extends alongside the facing leg of the bar, at a constant spacing 134, and likewise pointing vertically upwards. This leg is moreover parallel with the leg 1301) of the bar. The upper edge is cut straight; together with the corner-piece the U-shaped bar supports the glass plate and ensures that the assembly is firmly held in place. The mounting bar can replace one ofthe bars of the transverse piece, and its ends can be joined with the adjacent ends of the corresponding bars of the longitudinal side pieces, for example, by riveting. The leg l33b of the corner-piece longer than legs 1300, of the mounting bar; the bore 1330 serves for connection to the upper ends of the bars of the longitudinal side pieces. The lower edge of the glass plate or the like is supported against the liner or part of the liner.

The variant according to FIGS. 12 and 13 serves for doors with openings that extend to the ceiling and with an upper finishing member of wood or plastics material. In this case, the transverse part can be replaced by a mounting strip made of metal and having a rectangular cross-section. The dead-face rests against the underside 141 of this strip which can be connected with the bars of the longitudinal side pieces at its ends 142 and 143. With the two last mentioned variants, the two longitudinal side pieces are joined together, and stiffened, by the horizontal portion of the wooden lining between them, which replaces the transverse member.

We claim:

1. A jamb-liner comprising a mounting frame secured to the edge of a plaster covered wall which is encased by a masking frame comprising pre-manufactured parts which are directly joined together through a tongueand-groove system; there being moulded mounting strips at the vertical front faces of the mounting frame over which the parts of the masking frame are fitted from both sides, which parts are designed as continuous moulded strips which extend beyond the top of the mounting frame and down to floor level and which have a web which rests against the mounting frame and two legs one of which rests against the plaster with its edge flush with the wall surface while the other leg engages with a groove in the adjacent part of the masking frame.

2. A jamb-liner according to claim 1 in which the mounting frame consists of two longitudinal side pieces and a transverse piece which connects them at their upper ends, each piece consisting of two longitudinallyextending parallel bars and of cross-bands which extend at regular intervals between the parallel bars, the longitudinal side pieces and the transverse piece, which are pre-manufactured as individual elements, constituting independent structural components which can be assembled at the site of construction, one of the bars of each longitudinal side piece corresponding to one of the bars of the transverse piece and the distance between the bars of the longitudinal side pieces being equal to the distance between the bars of the transverse piece.

3. Ajamb-liner according to claim 2 in which the corresponding bars of the longitudinal side pieces and of the transverse piece are connected by means of an integral adaptor with two legs angled at approximately 90 and which are fixedly secured to the bars which have to be joined together.

4. A jamb-liner according to claim 3 in which the legs of the adaptor have rectangular cross-sections being composed of a flat main section which corresponds to the cross-web of the adjacent bar, and an edge-section which extends at right angles to the main section and points towards the outside of the frame, the main section of one of the legs, which rests in flat surface contact against the cross web of the U-shaped bar of the transverse piece, being flat-welded to this web while the edge section rests in flat surface contact against one of the legs of the U, and the main section of one of the legs lies flat, from the inside, against the cross web of the U-shaped bar of the corresponding longitudinal side piece to which it is riveted, the edge portion being in flat contact with one of the legs of the U.

5. A jamb-liner according to claim 2 in which the bars of the longitudinal side pieces and of the transverse piece have a U-shaped cross-section, the open end of the U pointing towards the outside and the two legs being of different lengths, whereby the shorter leg always lies at the side which is away from the brickwork.

6. A jamb-liner according to claim 2 in which the bars of each part are staggered in relation to each other in the direction of the door plane, whereby the bars in each part which are facing the door are recessed in relation to the door, the bars of the longitudinal side pieces and of the transverse piece which are facing the door being longer than the other bars of the respective parts, the difference corresponding approximately to the amount by which the bars of the individual parts are staggered in relation to each other, and the cross-bands of each part being cranked about halfway between the two bars which have to be connected, the amount of cranking corresponding approximately to the amount by which the two bars are staggered in relation to each other.

7. A jamb-liner according to claim 2 in which the two end sections of the bars of at least one of the longitudinal side pieces and of the transverse piece have the same form such that the two ends are shaped in such a manner that they can be manufactured in a single stamping operation.

8. A jamb-liner according to claim 7 in which the ends of the two bars of one of the longitudinal side pieces and of the transverse piece of the frame terminate in a broken line which is inclined in relation to the longitudinal axis of the bar and extends from the inside towards the outside towards the bent edge-portion of the adaptor, the edge extending at an angle from the outside and from the bottom towards the top and the inside and being suitably twice recessed.

9. A jamb-liner according to claim 2 having a mounting frame destined for door openings which extend to the ceiling, in which a plate is provided at the upper end of the doors and in which a mounting bar with a U- shaped cross-section can be exchanged for the transverse piece, the U opening downwards, and the mounting bar serving as a guiding and fitting member for the plate and carrying at least one corner piece which is fixed to the bar and serves as a means by which the mounting bar is connected with a longitudinal side piece.

10. A jamb-liner according to claim 9 in which the mounting bar can be inserted in place of one of the bars of the transverse part and connected at its ends with the adjacent ends of the corresponding bars of the longitudinal side piece.

11. A jamb-liner according to claim 1, having a mounting frame destined for door openings which extend to the ceiling, in which a dead-face is arranged at the upper portion of the door and in which the transverse piece can be replaced by a mounting strip which stands on edge, the strip serving to control and hold in place the dead-face, and serving as a replacement for one of the bars of the transverse piece,.its end portions being suitable for connection with the adjacent end portions of the bars of the longitudinal side pieces. 

1. A jamb-liner comprising a mounting frame secured to the edge of a plaster covered wall which is encased by a masking frame comprising pre-manufactured parts which are directly joined together through a tongue-and-groove system; there being moulded mounting strips at the vertical front faces of the mounting frame over which the parts of the masking frame are fitted from both sides, which parts are designed as continuous moulded strips which extend beyond the top of the mounting frame and down to floor level and which have a web which rests against the mounting frame and two legs one of which rests against the plaster with its edge flush with the wall surface while the other leg engages with a groove in the adjacent part of the masking frame.
 1. A jamb-liner comprising a mounting frame secured to the edge of a plaster covered wall which is encased by a masking frame comprising pre-manufactured parts which are directly joined together through a tongue-and-groove system; there being moulded mounting strips at the vertical front faces of the mounting frame over which the parts of the masking frame are fitted from both sides, which parts are designed as continuous moulded strips which extend beyond the top of the mounting frame and down to floor level and which have a web which rests against the mounting frame and two legs one of which rests against the plaster with its edge flush with the wall surface while the other leg engages with a groove in the adjacent part of the masking frame.
 2. A jamb-liner according to claim 1 in which the mounting frame consists of two longitudinal side pieces and a transverse piece which connects them at their upper ends, each piece consisting of two longitudinally-extending parallel bars and of cross-bands which extend at regular intervals between the parallel bars, the longitudinal side pieces and the transverse piece, which are pre-manufactured as individual elements, constituting independent structural components which can be assembled at the site of construction, one of the bars of each longitudinal side piece corresponding to one of the bars of the transverse piece and the distance between the bars of the longitudinal side pieces being equal to the distance between the bars of the transverse piece.
 3. A jamb-liner according to claim 2 in which the corresponding bars of the longitudinal side pieces and of the transverse piece are connected by means of an integral adaptor with two legs angled at approximately 90* and which are fixedly secured to the bars which have to be joined together.
 4. A jamb-liner according to claim 3 in which the legs of the adaptor have rectangular cross-sections being composed of a flat main section which corresponds to the cross-web of the adjacent bar, and an edge-section which extends at right angles to the main section and points towards the outside of the frame, the main section of one of the legs, which rests in flat surface contact against the cross web of the U-shaped bar of the transverse piece, being flat-welded to this web while the edge section rests in flat surface contact against one of the legs of the U, and the main section of one of the legs lies flat, from the inside, against the cross web of the U-shaped bar of the corresponding longitudinal side piece to which it is riveted, the edge portion being in flat contact with one of the legs of the U.
 5. A jamb-liner according to claim 2 in which the bars of the longitudinal side pieces and of the transverse piece have a U-shaped cross-section, the open end of the U pointing towards the outside and the two legs being of different lengths, whereby the shorter leg always lies at the side which is away from the brickwork.
 6. A jamb-liner according to claim 2 in which the bars of each part are staggered in relation to each other in the direction of the door plane, whereby the bars in each part which are facing the door are recessed in relation to the door, the bars of the longitudinal side pieces and of the transverse piece which are facing the door being longer than the other bars of the respective parts, the difference corresponding approximately to the amount by which the bars of the individual parts are staggered in relation to each other, and the cross-bands of each part being cranked about halfway between the two bars which have to be connected, the amount of cranking coRresponding approximately to the amount by which the two bars are staggered in relation to each other.
 7. A jamb-liner according to claim 2 in which the two end sections of the bars of at least one of the longitudinal side pieces and of the transverse piece have the same form such that the two ends are shaped in such a manner that they can be manufactured in a single stamping operation.
 8. A jamb-liner according to claim 7 in which the ends of the two bars of one of the longitudinal side pieces and of the transverse piece of the frame terminate in a broken line which is inclined in relation to the longitudinal axis of the bar and extends from the inside towards the outside towards the bent edge-portion of the adaptor, the edge extending at an angle from the outside and from the bottom towards the top and the inside and being suitably twice recessed.
 9. A jamb-liner according to claim 2 having a mounting frame destined for door openings which extend to the ceiling, in which a plate is provided at the upper end of the doors and in which a mounting bar with a U-shaped cross-section can be exchanged for the transverse piece, the U opening downwards, and the mounting bar serving as a guiding and fitting member for the plate and carrying at least one corner piece which is fixed to the bar and serves as a means by which the mounting bar is connected with a longitudinal side piece.
 10. A jamb-liner according to claim 9 in which the mounting bar can be inserted in place of one of the bars of the transverse part and connected at its ends with the adjacent ends of the corresponding bars of the longitudinal side piece. 